In my design, I am connecting an LM324 op-amp in the inverting mode and thus the output voltage would be negative of the input multiplied by th gain. But I am using a 5v and 0V power supply. So how is it possible to get a negative output when my power supply cannot have negative value. Do I need a dual power supply to achieve this?
The frequency range of both bandpass filters is from 0.7 hertz to 2.5 hertz. Both op amps should provide enough gain to raise my weak signal (+-0.3v) up to the TTL logic level of my microcontroller I.e around 4.7 v , if not I would add a comparator to do that.